| 摘要 |
PURPOSE:To prevent deterioration by recording a sound signal with frequency modulation after sampling it in a frequency of mfH at recording and sampling the frequency-modulated sound signal reproduced at reproduction by a signal in the mfH after demodulation and obtaining the sound signal. CONSTITUTION:A signal AL is demodulated from FM demodulators 431, 432 and applied to a switch circuit 45L through LPF441, 442. A signal AL' obtained from the switch circuit 45L is applied to a sampling value holding circuit 80L. A signal SH' in a frequency of 3fH is impressed to the holding circuit 80L from a PLL circuit 81 as a sampling signal. If a time axis error shown in solid lines is produced in the signal AL' obtained at the switch circuit 45L at the switching time point of heads 190 and 19 by the skew, and when the period of the sample part of the signal AL' is changed into tau'(not equal to tau) at the switching point of time from the normal value tau, since a signal SH' applied to a sampling value holding circuit 80L is unchanged, a signal AL'' is obtained at the output side of the sampling circuit 80L and the same signal as the normal value is obtained. Thus, the 1st sound signal AL unchanged normally from an LPF47L is obtained. |
